初一下册数学作业本第七章“分式”复习题11题
\u521d\u4e00\u4e0b\u518c\u6570\u5b66\u4f5c\u4e1a\u672c\uff082\uff09\u7b2c2\u7ae0\u590d\u4e60\u98981\u3001\u221a\u00d7\u00d7
2\u3001D
3\u30012\uff0c6\uff0c10\uff0c-108
4\u3001-7/5 , -20 , 6 , -14
5\u3001\u5341\u5206, 37.45 , 37.55
6\u30011.5\u00d710^7(\u5341\u7684\u4e03\u6b21\u65b9) \uff0c 1.2\u00d710^6
7\u3001D
8\u3001D
9\u3001-1,-1
10\u3001\u7b2c\u4e00\u6b21\u5269\u4e0b0.5\uff0c\u7b2c\u4e8c\u6b21\u52690.5\u00d70.5=1/4,\u7b2c\u516d\u6b21\u52690.5^6=1/64
11\u300113-8+(2.5\u00d750\u00f750)+0.5+(40\u00f750)+1=0.2
-85\u20140.2\u00d750=-75
\u5728\u897f\u9762\u768475\u5343\u7c73
12\u3001\u6700\u540e\u603b\u4f1a\u53d8\u6210153\uff0c\u800c\u4e14\u4e0d\u518d\u53d8\u5316
\u5b8c
m/1-m^2=1+(1/m+1)
1-n^2/-n^3+n=-1/n
3x/6x^2z=1/2xz
a+b/a^2-b^2=1/a-b
x^2+2x+1/x^2+x=1+1/x
3x-6/x^2-4x+4=3/x-2
12a^2b^3\u00f7(-8a^3b)=-3b^2/2a
(m^2-2m+1)\u00f7(m^2-1)=m-1/m+1
2、21/(X-4)=1.5×22/(X+4)
3、(X+4)/(X-4)=11/7
4、X=18km/H
21 / (v - 4) = 1.5 * 22 / (v + 4)
v = 18 km/h
21除以x-4=22除以x+4加4在乘以1.5就可以了
(x-4)*1.5y=21
(x+4)*y=22
求出解就可以了 ··
绛旓細1銆佽杞埞闈欐按閫熷害涓篨km/H 2銆21/(X-4)=1.5脳22/(X+4)3銆(X+4)/(X-4)=11/7 4銆乆=18km/H
绛旓細鏄垜鎴浘涓嬫潵鐨勩傚弬鑰冭祫鏂欙細鏍囧噯绛旀銆
绛旓細鍒嗗紡鐨勫姞鍑忥紙2锛塒S锛歑鐨勫钩鏂=x2 x鐨勭珛鏂=x3...浠ユ绫绘帹 1锛氾紙1锛5a 锛2锛塧鐨勫钩鏂筨鐨勫钩鏂=锛坅2b2锛2锛氾紙1锛塧+b/ab 锛2锛-1/6x 锛3锛4ab+b/4a2(a鐨勫钩鏂)3锛 锛1锛4m/(m+n)(m-n)锛2锛 -1/x+1 锛3锛-1/x2+x 锛4锛1/a-1 4锛 瑙ｏ細3x/(x-3)鐨勫钩鏂+x/x-3...
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绛旓細瑙ｏ紱璁綳闂村巶鎴 1000X=20000 X=20 720000/20=36000鍏 绛旓紱鍘熻鍒掓瘡闂村巶鎴36000鍏
绛旓細(x-2)x (2)2-3+3x=0 3.(1)x=3 鏄師鏂圭▼鐨勮В 锛2锛墄=-2 鏄師鏂圭▼鐨勮В 4.锛1锛墄=-4 鏄師鏂圭▼鐨勮В 锛2锛墄=-1/3 鏄師鏂圭▼鐨勮В 5.锛1锛墄=1/4 鏄師鏂圭▼鐨勮В 锛2锛墄=5/4 鏄師鏂圭▼鐨勮В 锛3锛墄=1/2 鏄師鏂圭▼鐨勮В 锛4锛墄=3 鏄師鏂圭▼鐨勮В 6.鏍规嵁棰樻剰鐨:x/69000-...
绛旓細涓涓嬫暟瀛︿綔涓氭湰銆 鍒嗗紡(2) 5 1銆傚～绌(m-2n)/(m^2-2mn)=1/()2.涓嶆敼鍙樺垎寮忕殑鍊,浣夸笅鍒楀悇寮忕殑鍒嗗瓙鍜屽垎姣嶇殑鏈楂樻椤圭殑绯绘暟鏄鏁1.(m)/(1-m^2)=2.(1-n^2)/(-n^3+n)3.涓嶆敼鍙樺垎寮忕殑鍊,浣夸笅鍒楀悇寮忕殑鍒嗗瓙鍜屽垎姣嶄腑鍚勯」鐨... 1銆傚～绌(m-2n)/(m^2-2mn)=1/( )2.涓嶆敼鍙樺垎寮忕殑鍊,浣...
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绛旓細1. x+20 5000^x+20 4800^x=5000^x+20 2. (1) U^R (2) s^蟺r 3. B 4. 150*(1+25%)=120 5. b=1-ax^a 6. (72-70)闄や互0.1=20 (闂) 72闄や互20=3.6锛堜竾鍏冿級
绛旓細5=20X X=1/4 锛2锛(5/x)-锛5/2x 锛=2 5/2x=2 X=5/4 锛3锛(3-x/1-x)-1=2/x 1+2/锛1-X锛-1=2/X 2/锛1-X锛=2/X 2X=2锛1-X锛塜=1/2 锛4锛(3-x/x-4)+(1/4-x)=1 (3-x/x-4)- (1/X-4)=1 锛2-X锛/锛圶-4)=1 2-X=X-4 X=3 ...
